@incollection{einstein1966socialism,
title={Why socialism?},
author={Einstein, Albert},
booktitle={Marx Today: Selected Works and Recent Debates},
pages={171--175},
year={1966},
publisher={Springer}
}
This reference was shared by @sergio. 
My highlights: https://ia601600.us.archive.org/35/items/elopio-papers/1949-why_socialism.pdf
Is it advisable for one who is not an expert on economic and social issues to express views on the subject of socialism?
Since the real purpose of socialism is precisely to overcome and advance beyond the predatory phase of human development, economic science in its present state can throw little light on the socialist society of the future.
Science cannot create ends and, even less, instill them in human beings; science, at most, can supply the means by which to attain certain ends. Ends themselves are conceived by personalities with lofty ethical ideal.
As a solitary being, he attempts to protect his own existence and that of those who are closest to him, to satisfy his personal desires, and to develop his innate abilities.
As a social being, he seeks to gain the recognition and affection of his fellow human beings, to share in their pleasures, to comfort them in their sorrows, and to improve their conditions of life.
Their specific combination determines the extent to which an individual can achieve an inner equilibrium and can contribute to the well-being of society.
[Humans] do not experience this dependence [to society] as a positive asset, as an organic tie, as a protective force, but rather as a threat to his natural rights, or even to his economic existence.
The economic anarchy of capitalist society as it exists today is the real source of the evil.
Establish of a socialist economy, accompanied by an educational system oriented toward social goals. The means of production owned by society itself and utilized in a planned fashion, which adjusts production to the needs of the community, distributes the work to be done among all those able to work and would guarantee a livelihood to every man, woman, and child. The education of the individual, in addition to promoting his own innate abilities, would attempt to develop in [them] a sense of responsibility for his fellow [humans] in place of the glorification of power and success in our present society.
A planned economy is not yet socialism.
How to prevent bureaucracy from becoming all-powerful and overweening?
How can the rights of the individual be protected and therewith a democratic counterweight to the power of bureaucracy be assured?
Under present circumstances, free and unhindered discussion of these problems has come under a powerful taboo.